// With the Arduino Mega, the choices are a bit more involved:// 1) You can still use SoftwareSerial and connect the camera to// a variety of pins...BUT the selection is limited. The TX// pin from the camera (RX on the Arduino, and the first// argument to SoftwareSerial()) MUST be one of: 62, 63, 64,// 65, 66, 67, 68, or 69. If MEGA_SOFT_SPI is set (and using// a conventional Arduino SD shield), pins 50, 51, 52 and 53// are also available. The RX pin from the camera (TX on// Arduino, second argument to SoftwareSerial()) can be any// pin, again excepting those used by the SD card.// 2) You can use any of the additional three hardware UARTs on// the Mega board (labeled as RX1/TX1, RX2/TX2, RX3,TX3),// but must specifically use the two pins defined by that// UART; they are not configurable. In this case, pass the// desired Serial object (rather than a SoftwareSerial// object) to the VC0706 constructor.